GreatDane(modeled by Chris Baker)
The Original Quadruped Rig built for the Autodesk MasterClass "Quadruped Animator Friendly Rigging". Only the segmented mesh with the control rig is available. There is no smooth skin nor facial setup yet.
Download model (Maya 8 and higher)

IK-Joe v3
Yet another different rig for IK-Joe.
This version has a very nice, simple yet advanced facial setup, plus quite a few new goodies.
Maker sure to read the PDF file for some insight on v3.Download model (Maya 5)

IK-Joe XSI(Rigged by Stefan Anderson)
Stefan Andersson made available his XSI version of the popular IK-Joe. This time for XSI users.Download model (XSI 3.5.1)